From 866f2c6cd0a21810e2e330efed3ac3025ca74659 Mon Sep 17 00:00:00 2001
From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: Sun, 26 May 2019 16:05:10 +0200
Subject: [PATCH] mt76: generalize mt76_get_txpower for 4x4:4 devices

Genralize mt76_get_txpower routine for 4x4:4 capable devices
in order to be reused in mt7615 driver

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 mac80211.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/mac80211.c b/mac80211.c
index e70507a4..f9e83971 100644
--- a/mac80211.c
+++ b/mac80211.c
@@ -766,10 +766,21 @@ int mt76_get_txpower(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	*dbm = DIV_ROUND_UP(dev->txpower_cur, 2);
 
 	/* convert from per-chain power to combined
-	 * output on 2x2 devices
+	 * output power
 	 */
-	if (n_chains > 1)
+	switch (n_chains) {
+	case 4:
+		*dbm += 6;
+		break;
+	case 3:
+		*dbm += 4;
+		break;
+	case 2:
 		*dbm += 3;
+		break;
+	default:
+		break;
+	}
 
 	return 0;
 }